private void button1_Click(object sender, EventArgs e)
      {
          /*String ruta2 = "C:\\Users\\Pere\\source\\repos\\ConsoleBasicAplications\\StandardDataSet.csv";
           * TextWriter txt = new StreamWriter(ruta2);
           * txt.WriteLine(textBox1.Text + " " + textBox2.Text + " " + numericUpDown1.Value);
           * txt.Close();
           * Persons();*/
          PersonList pl = new PersonList();

          pl.FirstName = textBox1.Text;
          pl.LastName  = textBox2.Text;
          pl.Age       = numericUpDown1.Value.ToString();
          pl.IsAlive   = checkBox1.Checked;
          persons.Add(pl);
          listBox1.Items.Add(textBox1.Text + "," + textBox2.Text + "," + numericUpDown1.Value + "," + checkBox1.Checked);
      }
      public void Persons()
      {
          String ruta = "C:\\Users\\Pere\\source\\repos\\ConsoleBasicAplications\\StandardDataSet.csv";

          List <string> lines = File.ReadAllLines(ruta).ToList();

          lines.RemoveAt(0);
          foreach (var linia in lines)
          {
              string[]   content = linia.Split(',');
              PersonList pl      = new PersonList();
              pl.FirstName = content[0];
              pl.LastName  = content[1];
              pl.Age       = content[2];
              pl.IsAlive   = Convert.ToBoolean(Convert.ToInt32(content[3]));

              persons.Add(pl);
              listBox1.Items.Add(linia);
          }
          //UptadePerson();
      }